Method and apparatus for convection brazing of aluminum heat exc

Details Method and apparatus for convection brazing of aluminum heat exc Method and apparatus for convection brazing of aluminum heat exc

1991-09-25

1992-09-15

Rowan, Kurt

Metal fusion bonding

Including means to apply flux or filler to work or applicator

Gaseous flux

228 9, 228222, 432 4, 432 77, B23K 100, F27D 704, F27D 900, F27D 1502

Patent

active

051470837

ABSTRACT:
A convection braze furnace for brazing aluminum heat exchangers in an inert gas rich atmosphere includes entrance and exit vestibules forming atmosphere barriers of suspended stainless steel strips. The interior of the braze furnace is divided into multiple zones for progressively heating the heat exchangers to a brazing temperature and then cooling the heat exchangers in the final zone. An impeller circulates the heated intent gas atmosphere within each zone to accelerate heat transfer. A chain type conveyor supports the heat exchangers as they are moved through the braze furnace. An isolated return tube surrounds the lower return side of the conveyor chain as it passes through the braze furnace. The braze furnace housing is comprised of inner and outer shells having an inert gas pressurized cavity interstitial therebetween. The inner shell includes a plurality of expansion strips having generally ellipsoidal corner expansion joints.

REFERENCES:
patent: 3048383 (1962-08-01), Champlin
patent: 3426953 (1969-02-01), Metzger et al.
patent: 3702692 (1972-11-01), Metzger et al.
patent: 3882596 (1975-05-01), Kendziora et al.
patent: 4932864 (1990-06-01), Miyabe

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